Goes 45 holes without a bogey at Bethpage Black.
U.S. Amateur championship endures Mich. course.
Columbus-area tournament to finish today.
46-year-old American finished the tournament 11-under par.
Par putt on last hole gives golfer first major title
First major championship for 20-year-old.
Walker, Streb tied for lead, but neither has teed off in 3rd round.
Day goes on tear, sits 3 shots back of lead at year's final major.
LPGA team event won by Americans including Lewis.
Amateur du Toit, Johnson close behind.